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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

March/April 2011
Volume 13 , Issue 2



Pages: 131 - 137
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Influence of Different Enamel Substrates on Microtensile Bond Strength of Sealants After Cariogenic Challenge

Kantovitz, Kamila Rosamilia / Pascon, Fernanda Miori / Alves, Marcelo Correa / Nociti, Francisco Humberto Jr / Tabchoury, Cinthia P. Machado / Puppin-Rontani, Regina Maria

Purpose: To evaluate the microtensile bond strength (μTBS) of resin sealer on enamel substrates after cariogenic challenge. Materials and Methods: Enamel blocks were obtained from human third molars and randomly divided into 6 groups (n = 10) according to enamel substrates (S: sound, CL: caries-like lesion, or CLTF: caries-like lesion + topical fluoride application) and sealant material (F: FluroShield, or H: Helioseal Clear Chroma). Sealants were placed on enamel surfaces, stored in 100% humidity (24 h, 37C), and longitudinally sectioned into hourglass shapes. According to the groups, pH cycling was applied and the μTBS test was performed. The fracture patterns were assessed by SEM. Results: Regarding substrates, the highest μTBS values in MPa were observed for CLTF enamel (26.0 7.6), followed by S (22.0 7.4) and CL (15.5 4.9). A significant interaction was found between material and pH cycling (p = 0.0395). F (23.9 7.6) showed higher μTBS values than H (18.3 7.5) when submitted to pH cycling. The majority of samples presented mixed failure. Conclusions: Enamel substrate significantly affected μTBS, with the highest values for remineralized caries-like enamel lesions. Furthermore, μTBS values were dependent on both materials and pH cycling.

Keywords: preventive therapy, microtensile bond strength, fissure sealing, enamel, caries-like lesion, cariogenic challenge model

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